﻿//Copyright (c) 2009, Offbeat Guides
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without modification, are 
//permitted provided that the following conditions are met:
//
//* Redistributions of source code must retain the above copyright notice, this list of 
//conditions and the following disclaimer.
//
//* Redistributions in binary form must reproduce the above copyright notice, this list 
//of conditions and the following disclaimer in the documentation and/or other materials 
//provided with the distribution.
//
//* Neither the name of Offbeat Guides nor the names of its contributors may be used to 
//endorse or promote products derived from this software without specific prior written 
//permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
//EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
//OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
//SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
//SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
//OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
//HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 
//TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
//EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Net;
using System.Security.Cryptography;

namespace Amazon.Services
{
    public static class Utility
    {
        #region Static Methods
        public static String ToQueryString(IDictionary<String, String> parameters)
        {
            StringBuilder data = new StringBuilder();
            foreach (String key in parameters.Keys)
            {
                if (parameters[key] != null)
                    data.AppendFormat("{0}={1}&", key, Utility.UrlEncode(parameters[key]));
            }
            return data.Remove(data.Length - 1, 1).ToString();
        }

        public static String UrlEncode(String data)
        {
            StringBuilder encoded = new StringBuilder();
            String unreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

            foreach (char symbol in System.Text.Encoding.UTF8.GetBytes(data))
            {
                if (unreservedChars.IndexOf(symbol) != -1)
                    encoded.Append(symbol);
                else
                    encoded.Append("%" + String.Format("{0:X2}", (int)symbol));
            }

            return encoded.ToString();

        }

        public static String EscapeXml(String str)
        {
            str = str.Replace("&", "&amp;");
            str = str.Replace("<", "&lt;");
            str = str.Replace(">", "&gt;");
            str = str.Replace("'", "&#039;");
            return str.Replace("\"", "&quot;");
        }

        public static String UnescapeXml(String str)
        {
            str = str.Replace("&quot;", "\"");
            str = str.Replace("&#039;", "'");
            str = str.Replace("&gt;", ">");
            str = str.Replace("&lt;", "<");
            return str.Replace("&amp;", "&");
        }
        #endregion
    }
}
